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Soldering strengthening method for thermal sprayed coating on surface of metal material

A metal material, thermal spraying technology, applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problems of low bonding strength of coating, high porosity of coating, low bonding strength of coating, etc.

Inactive Publication Date: 2012-09-05
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a surface treatment technology, thermal spraying technology has many deficiencies. Since the coating is obtained after atomization deposition of molten spraying materials, the coating has high porosity and poor uniformity.
Especially after the spraying material is deposited on the surface of the substrate, it is mechanically bonded with the substrate, resulting in low bonding strength of the coating
The low bonding strength of the coating makes the coating prepared by this technology easy to peel off, unable to bear the impact force, and the excellent performance of the coating cannot be fully exerted, which limits its application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The brazing strengthening of embodiment 1 metal material surface thermal spray coating

[0019] Base Material: Carbon Steel.

[0020] The mass percent of the solder powder composition is: 8% Al, 3% Cu, 91% Zn, and the thickness of the solder layer: 0.1 mm.

[0021] Coating material: aluminum powder, coating thickness: 0.2mm.

[0022] Thermal spraying method: plasma spraying.

[0023] Plasma flame heating temperature: 600°C.

Embodiment 2

[0024] The brazing strengthening of embodiment 2 metal material surface thermal spray coating

[0025] Base Material: Carbon Steel.

[0026] The mass percent of the solder powder composition is: 12% Cr, 10% P, 78% Ni, and the thickness of the solder layer: 0.1 mm.

[0027] Coating material: Ni60 self-fluxing alloy powder, coating thickness: 0.2mm.

[0028] Thermal spraying method: plasma spraying.

[0029] Plasma flame heating temperature: 900°C.

Embodiment 3

[0030] The brazing strengthening of embodiment 3 metal material surface thermal spray coating

[0031] Base material: alloy steel.

[0032] The mass percent of the solder powder composition is: 5% Cr, 2% B, 3% Si, 2% Fe, 88% Ni, and the thickness of the solder layer: 0.1mm.

[0033] Coating material: cemented carbide powder, coating thickness: 0.2mm.

[0034] Thermal spraying method: plasma spraying.

[0035] Plasma flame heating temperature: 1100°C.

[0036] In Examples 1-3, the thermal sprayed coating is strengthened by brazing, and a metallurgical bond is formed between the coating and the substrate, and the bonding strength (shear tensile strength) of the thermal sprayed coating and the substrate is greater than 250MPa.

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Abstract

The invention relates to a soldering strengthening method for a thermal sprayed coating on the surface of a metal material. The method comprises the following steps of: firstly, spraying a solder layer on the surface of a metal material and spraying a coating needed to be prepared on the surface of the solder layer by adopting a thermal spraying method, wherein the melting point of the solder layer is lower than a coating material and a substrate material; and then, carrying out plasma plume flow heating to the surface of the coating to melt the solder layer, welding the coating and the substrate together by the molted solder layer, and cooling to generate metallurgical bonding between the coating and the substrate. In the invention, the thermally sprayed coating is strengthened by using the soldering method, metallurgical bonding is generated between the coating and the substrate, and the bonding strength (shearing tensile strength) of the obtained thermal sprayed coating is greater than 250 MPa.

Description

technical field [0001] The invention relates to a brazing strengthening method for a thermal spray coating on the surface of a metal material, and belongs to the technical field of material engineering. Background technique [0002] Thermal spraying technology is one of the most effective technologies for endowing materials with new functions in the field of surface engineering, and its proportion in the field of surface engineering is increasing. It is a surface processing technology that uses a heat source to heat the spray material to a molten state, and atomizes it to the surface of the part at high speed through air blowing to form a spray layer. Thermal spraying technology is widely used. Different coating materials and spraying processes can be selected to prepare different functional coatings, such as wear and corrosion resistance, oxidation resistance, thermal barrier, far-infrared radiation, biological functions, etc. However, as a surface treatment technology, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/00
Inventor 周小平胡心彬
Owner HUBEI UNIV OF TECH